My Math Forum Conditional Probability Easy question

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 June 21st, 2017, 06:09 PM #1 Newbie   Joined: May 2012 Posts: 6 Thanks: 0 Conditional Probability Easy question How come on the first question he did not add 3/20? to 3/20 + 6/20? Was it cause it was separated by the word "OR" meant it was a different problem? Should the answer be 3/20 + 3/20 +6/20 = 12/20
 June 21st, 2017, 06:44 PM #2 Senior Member   Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics There were two questions in the video: P(Yellow), which is 3/20, and P(Red or Purple), which is 9/20.

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